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From: Tejun Heo <tj@kernel.org>
To: Yi Tao <escape@linux.alibaba.com>
Cc: gregkh@linuxfoundation.org, lizefan.x@bytedance.com,
	hannes@cmpxchg.org, mcgrof@kernel.org, keescook@chromium.org,
	yzaikin@google.com, linux-kernel@vger.kernel.org,
	cgroups@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	shanpeic@linux.alibaba.com
Subject: Re: [RFC PATCH 0/2] support cgroup pool in v1
Date: Wed, 8 Sep 2021 06:35:11 -1000	[thread overview]
Message-ID: <YTjmP0EGEWGYhroM@slm.duckdns.org> (raw)
In-Reply-To: <cover.1631102579.git.escape@linux.alibaba.com>

Hello,

On Wed, Sep 08, 2021 at 08:15:11PM +0800, Yi Tao wrote:
> In order to solve this long-tail delay problem, we designed a cgroup
> pool. The cgroup pool will create a certain number of cgroups in advance.
> When a user creates a cgroup through the mkdir system call, a clean cgroup
> can be quickly obtained from the pool. Cgroup pool draws on the idea of
> cgroup rename. By creating pool and rename in advance, it reduces the
> critical area of cgroup creation, and uses a spinlock different from
> cgroup_mutex, which reduces scheduling overhead on the one hand, and eases
> competition with attaching processes on the other hand.

I'm not sure this is the right way to go about it. There are more
conventional ways to improve scalability - making locking more granular and
hunting down specific operations which take long time. I don't think cgroup
management operations need the level of scalability which requires front
caching.

Thanks.

-- 
tejun

  parent reply	other threads:[~2021-09-08 16:35 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08 12:15 [RFC PATCH 0/2] support cgroup pool in v1 Yi Tao
2021-09-08 12:15 ` Yi Tao
2021-09-08 12:15 ` [RFC PATCH 1/2] add pinned flags for kernfs node Yi Tao
2021-09-08 12:15   ` [RFC PATCH 2/2] support cgroup pool in v1 Yi Tao
2021-09-08 12:15     ` Yi Tao
2021-09-08 12:35     ` Greg KH
2021-09-08 12:35       ` Greg KH
     [not found]       ` <084930d2-057a-04a7-76d1-b2a7bd37deb0@linux.alibaba.com>
2021-09-09 13:27         ` Greg KH
2021-09-10  2:20           ` taoyi.ty
2021-09-10  2:15       ` taoyi.ty
2021-09-10  2:15         ` taoyi.ty
2021-09-10  6:01         ` Greg KH
2021-09-10  6:01           ` Greg KH
2021-09-08 15:30     ` kernel test robot
2021-09-08 16:52     ` kernel test robot
2021-09-08 17:39     ` kernel test robot
2021-09-08 17:39     ` [RFC PATCH] cgroup_pool_mutex can be static kernel test robot
2021-09-08 12:35   ` [RFC PATCH 1/2] add pinned flags for kernfs node Greg KH
2021-09-08 12:35     ` Greg KH
2021-09-10  2:14     ` taoyi.ty
2021-09-10  6:00       ` Greg KH
2021-09-10  6:00         ` Greg KH
2021-09-08 16:26   ` kernel test robot
2021-09-08 12:37 ` [RFC PATCH 0/2] support cgroup pool in v1 Greg KH
2021-09-10  2:11   ` taoyi.ty
2021-09-10  6:01     ` Greg KH
2021-09-10  6:01       ` Greg KH
2021-09-10 16:49     ` Tejun Heo
2021-09-10 16:49       ` Tejun Heo
2021-09-13 14:20       ` Christian Brauner
2021-09-13 14:20         ` Christian Brauner
2021-09-13 16:24         ` Tejun Heo
2021-09-13 16:24           ` Tejun Heo
2021-09-08 16:35 ` Tejun Heo [this message]
2021-09-10  2:12   ` taoyi.ty

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